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Eight-year-old Elwood, a Chinese crested and Chihuahua mix, died in his owner's home in New Jersey on American Thanksgiving.

Elwood was crowned the world's ugliest dog at a contest in California in 2007 and later became the topic of a children's book preaching acceptance.

His owner, Karen Quigley, says there was more to her pet than his unique looks.

"He touched lives around the world with his messages of accepting differences and helping homeless animals," Quigley told QMI Agency in an email. "He helped people recognize the importance of helping homeless animals and that pit bulls are loving dogs, and he taught young and old to embrace who they are and be proud of their difference while teaching others to accept difference.

"Elwood lived a full life being loved and giving love back to everyone, and that's why people around the world love him so much," she added.

Quigley says Elwood prompted her to write and self-publish Everyone Loves Elwood, a kids' book about the importance of ignoring differences and connecting on a deeper level.

The book, available on Elwood's website, is a favourite of teachers and has sold thousands of copies, according to USA Today.